A tightly-fitting garment-like device that is a component of a high frequency chest wall oscillation airway secretion-clearing system and which is worn to encompass the thorax of a patient during high frequency chest wall oscillation (HFCWO) treatment. It is connected via a dedicated thick-walled hose to the system's generator which rapidly inflates and deflates the vest against the chest wall to promote airway clearance by creating HFCWO resulting in the mobilization of bronchial secretions. This is a reusable device.